linux-kernel - [PATCH 06/12] KVM: X86/MMU: Rename mmu_unsync_walk() to mmu_unsync_walk_and

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Date:   Sun,  5 Jun 2022 14:43:36 +0800
From:   Lai Jiangshan <jiangshanlai@...il.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Maxim Levitsky <mlevitsk@...hat.com>,
        Lai Jiangshan <jiangshan.ljs@...group.com>
Subject: [PATCH 06/12] KVM: X86/MMU: Rename mmu_unsync_walk() to mmu_unsync_walk_and_clear()

From: Lai Jiangshan <jiangshan.ljs@...group.com>

mmu_unsync_walk() and __mmu_unsync_walk() requires the caller to clear
unsync for the shadow pages in the resulted pvec by synching them or
zapping them.

All callers does so.

Otherwise mmu_unsync_walk() and __mmu_unsync_walk() can't work because
they always walk from the beginning.

And mmu_unsync_walk() and __mmu_unsync_walk() directly clear unsync bits
now, rename it.

Signed-off-by: Lai Jiangshan <jiangshan.ljs@...group.com>
---
 arch/x86/kvm/mmu/mmu.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 2446ede0b7b9..a56d328365e4 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -1773,7 +1773,7 @@ static inline void clear_unsync_child_bit(struct kvm_mmu_page *sp, int idx)
 	__clear_bit(idx, sp->unsync_child_bitmap);
 }
 
-static int __mmu_unsync_walk(struct kvm_mmu_page *sp,
+static int __mmu_unsync_walk_and_clear(struct kvm_mmu_page *sp,
 			   struct kvm_mmu_pages *pvec)
 {
 	int i, ret, nr_unsync_leaf = 0;
@@ -1793,7 +1793,7 @@ static int __mmu_unsync_walk(struct kvm_mmu_page *sp,
 			if (mmu_pages_add(pvec, child, i))
 				return -ENOSPC;
 
-			ret = __mmu_unsync_walk(child, pvec);
+			ret = __mmu_unsync_walk_and_clear(child, pvec);
 			if (ret < 0)
 				return ret;
 			nr_unsync_leaf += ret;
@@ -1818,7 +1818,7 @@ static int __mmu_unsync_walk(struct kvm_mmu_page *sp,
 
 #define INVALID_INDEX (-1)
 
-static int mmu_unsync_walk(struct kvm_mmu_page *sp,
+static int mmu_unsync_walk_and_clear(struct kvm_mmu_page *sp,
 			   struct kvm_mmu_pages *pvec)
 {
 	pvec->nr = 0;
@@ -1826,7 +1826,7 @@ static int mmu_unsync_walk(struct kvm_mmu_page *sp,
 		return 0;
 
 	mmu_pages_add(pvec, sp, INVALID_INDEX);
-	return __mmu_unsync_walk(sp, pvec);
+	return __mmu_unsync_walk_and_clear(sp, pvec);
 }
 
 static void kvm_mmu_page_clear_unsync(struct kvm *kvm, struct kvm_mmu_page *sp)
@@ -1962,7 +1962,7 @@ static int mmu_sync_children(struct kvm_vcpu *vcpu,
 	LIST_HEAD(invalid_list);
 	bool flush = false;
 
-	while (mmu_unsync_walk(parent, &pages)) {
+	while (mmu_unsync_walk_and_clear(parent, &pages)) {
 		bool protected = false;
 
 		for_each_sp(pages, sp, parents, i)
@@ -2279,7 +2279,7 @@ static int mmu_zap_unsync_children(struct kvm *kvm,
 	if (parent->role.level == PG_LEVEL_4K)
 		return 0;
 
-	while (mmu_unsync_walk(parent, &pages)) {
+	while (mmu_unsync_walk_and_clear(parent, &pages)) {
 		struct kvm_mmu_page *sp;
 
 		for_each_sp(pages, sp, parents, i) {
-- 
2.19.1.6.gb485710b